She said she would never have taken up with Watts had she known he had a wife.

"He was married, he had a wife at home, pregnant, two daughters at home," said McMahon. "I know how that hurts. I wouldn't do that to her."

There's also speculation that Watts was inspired to blame the death of his daughters on his wife by the 2010 movie "Shutter Island," starring Leonardo DiCaprio. In it, DiCaprio plays a husband who murders his wife in a rage after she kills their children.

After his initial arrest, Watts told investigators Shan'ann killed the children after he asked for a separation and he in turn strangled her in a rage.

He later confessed to all three murders to avoid the death penalty and was sentenced to five life sentences in late November.